41UTB
BOAT CHARACTERISTICS
&
CREW RESPONSIBILITIES
MISSIONS
The 41' UTB is the general workhorse at
multi-mission
units. It is designed to operate under
moderate weather
and sea condition
41 UTB HULL
 The boat has an aluminum hull with main
deck flush over the engines and a selfbailing well deck aft.
 It is of modified planing hull design, with a
deep-V bow spreading gradually to form a
wide, low-deadrise stern.
 It slopes downward to its deepest point 4'1"
below the water line at Frame 9
HULL THICKNESS
 The hull plating has three thicknesses to withstand
varied stresses.
 Between the gunwale and chines, the plating is
3/16".
 Between the chines and keel, the thickness is 1/4",
 Except between Frames 11 and Bulkhead 13
where 5/16" plating helps to withstand stress
caused by the propellers, propeller struts, and
rudders.
3/16”
5/16”
¼”
Gunwale to Chine
Chine to Keel
Extra Plating
FR 11-FR 13
THE 5 COMPARTMENTS
Compartment Location
Forepeak Bow to bulkhead 2
(watertight)
Passenger Compartment Bulkhead 2 to 6
(not watertight)
Engine Room Bulkhead 6
to 10
(watertight to main deck)
Fuel Tank Bulkhead 10 to
Frame 11
(watertight to well-deck)
Lazarette Frame 11 to Transom
(watertight)
FOREPEAK
THE FORWARD BITT
The anchor line chain hangs inside the bitt.
A 7/16" screw pin shackle
attached to the chafe chain hangs from a hook on the
bottom of the bitt cap cover.
The anchor line (300' of 2 3/4" double-braided nylon line)
line is stowed inside the forepeak Nine feet of " galvanized
chafe chain is attached to the anchor line by a 5/8"
screw pin shackle and 1/2" swivel.
FOREPEAK

2 DANFORTH ANCHORS ARE PLACED HERE
1 22 or 25-pound Danforth anchor is on the cabin top,
starboard side
1 Spare anchor is stowed inside the forepeak on
brackets attached to Bulkhead 2.
Passenger Compartment
 The passenger compartment is the primary
stowage location for boat outfit equipment.
 It also serves as an area to bring survivors.
A porta-potti is secured by strap belts on the
centerline forward in the Head.
An emergency escape hatch is in the cabin
top. Directly above
Passenger Compartment
 Two 21" x 33" deck hatches are just aft of
the head door, providing access to the
passenger compartment bilge
 A 64" stainless steel handrail is mounted to
the passenger compartment overhead,
starboard cabin side.
 A second handrail is on the port side, which
leads aft and out of the compartment.
The gun locker is located just aft of the starboard berth
seat.
Passenger Compartment
 A 5-pound CO2 fire extinguisher is mounted
on the aft bulkhead of the gun locker.
 A 24-hour clock is mounted above the sink
area just aft of the paper towel dispenser.
 Bilge pump/float switch located just fwd of
bulkhead 6 port side of keel.
A Engine Room Viewing Window on bulkhead 6 to
viewing without entry.
Up to the Pilot House
The Pilothouse
This deck-level weather tight area houses
most of the navigation and communication
equipment.
The four or six-person raft is on a shelf on the aft
starboard side of the pilothouse bulkhead.
The two 62" long, stainless steel handrails run fore
& aft along both sides of the pilothouse top. They
follow the contour of the pilothouse.
The fwd deck handrails continue aft along the
side of the pilothouse ending at a height even with
the window.
Pilothouse Aft Bulkhead
The riser
is a 2 " water
supply door
pipe rising
 The
compartment
access
is in vertically
the aft
from the deck,
just aft
pilothouse, This
starboard
bulkhead
to port
of of
thethecenterline.
doorof(with
the centerline.
window) is weathertight but not watertight.
Pilot House
 Engine Stop Cables:
 Starboard and forward of the wheel, 8" and 12" off the
centerline, are T-handled cables that shut off fuel to the
engines.
CAUTION !
 When the engines are not running the engine stop cables
must always be in the UP position. This prevents fuel
leakage past the injector nozzle into the cylinders,
which may cause a hydraulic lock of the engine.
 Engine RPM :
 Normal idle is 700 to 725 RPM. Maximum
allowable RPM is 2700. Maximum continuous
duty speed is 2300 RPM. Red line marking is
at 2700 RPM.
Main Deck (Aft of Pilothouse)
 Tow bitt:
 The tow bitt is 6" forward of Bulkhead 10,
main deck, centerline. It is made of schedule
80 aluminum pipe. It may be polished to
allow smoother operation when tending
a tow.
Main Deck Aft
 A 4' x 6' watertight hatch with spring-loaded
hinges and engine flush-mounted dogs is
over each engine.
 Inspect the hatches regularly and keep them
watertight. Leaks can flood the turbocharger
Intakes and damage the engine.
 A 24" ring buoy rests in brackets welded to
the outboard side of the port handrail.
Main Deck Aft
Main engine air intake vents:
These vent ducts are outboard of the handrails
between Frame 9 and Bulkhead 10. They provide
fresh air intake vents to the engine room.
The 17’ mast is on the centerline just aft of the
pilothouse bulkhead (at Frame 7) and is hinged to
fold down aft.
Well Deck
 Access to the lazarette is through a 19" x
26", scuttle flush-mounted, watertight
scuttle.
 Sounding tubes are on the inboard side of
the deck boxes aft of Bulkhead 10 both port
and starboard sides.
 A 5 gallon gas can is located inboard of the
port deck box.
 The tow line reel holds 600' of 2 3/4" DBN
line.
Well Deck
 The Dewatering Pump is secured in a
special bracket on the starboard side
inboard of the deck stowage box.
 Fuel tank vents: These vents are just aft of
Bulkhead 10, port and starboard gunwales.
They are fitted with 40-mesh flame screens.
 The Rudder arms are under the transom
deck between Frames 12 and Bulkhead 13.
Well Deck
 Emergency tiller: The emergency tiller is
stored in the lazarette between Frame 12
and Bulkhead 13 in brackets mounted to the
port side.
 Fuel Tanks: Two fuel tanks with a common
center bulkhead are between Bulkhead 10
and Frame 11. They run athwartship (not
fully side to side), and are built into the hull.
Capable of holding a total of 486.8 Gallons
total.
8 Cleats
 The boat has eight 15" stainless-steel deck
cleats, paired port and starboard.
 The cleats are bolted through the deck, and
are designed to withstand the force of boats
towed alongside.
2 ¾” DBN
 Four mooring lines, two 30' lengths and two
60' lengths of 2 3/4" DBN, are required.
They are stowed in the passenger
compartment stowage area. Units are
authorized up to 150' of additional line,
stowed in the storage area, as the operating
area dictates.
Boat Specs
 Length, w/rub rails . . . . . . . . . . . . 41’ 3 ¾”
 Beam, w/rub rails . . . . . . . . . . . . . . 14’ 1”
 Freeboard (Bow) . . . . . . . . . . . . . . 4’ 6”
 Freeboard, amidships (Frame 7) . . . 3’ 9”
 Freeboard, (Stern) . . . . . . . . . . . . . . . 2’ 9”
 Draft (maximum) (Frame 9) . . . . . 4’ 1”
Boat Specs
 Fixed height above water line
(Top of radar antenna) . . . . . . . . . . . . 13’ 2”
 Mast height (top of RDF antenna) . . . .17’
 Unfixed height above water line
(top of AM antenna) . . . . . . . . . . . . . 26’ 8”
Boat Specs
 Endurance (max speed) . . . . . . . 10.5
hours
 Range
At 18 knots. (2,000 rpm) . . . . . . . . . 300 NM
 Displacement full load . . . 30,000 pounds
 Crew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
 Passengers . . . . . . . . . . . . . . . . . . . . . . 20
Crew Responsibilities
Crew Responsibilties
COXSWAIN
YES
NO!
Responsibilties

COXSWAIN
 The coxswain is responsible, in order of
precedence, for:
 safety and conduct of passengers and crew,
 safe operation and navigation of the boat,
 completion of the sortie or mission(s),
 safeguarding of life and property,
Responsibilties
CREWMEMBER
Assists the coxswain as directed
securing the boat's equipment;
line handling; and serving as a lookout
towing watch, damage control,
swimmer, or helmsman.
Responsibilities
 The engineer assists the coxswain as
directed and is responsible for:
 engines and all power equipment; and
 assisting in boat navigation,
line
handling,
Engineer
lookout,
 towing watch, or helmsman.
Test
TEST